# Yi-1.5-34B vs Yi-34B

> Yi-1.5-34B is the stronger model overall, scoring 30.6 to 27.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/yi-1-5-34b-vs-yi-34b
- Last updated: 2026-10-11
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Yi-1.5-34B scores higher in 8 categories and Yi-34B in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Yi-1.5-34B leads 14.8 to 7.5.
- The biggest single-benchmark swing is MATH Level 5: 25.5% for Yi-1.5-34B and 5.1% for Yi-34B.

## Snapshot

| | Yi-1.5-34B | Yi-34B |
|---|---|---|
| Provider | 01.AI | 01.AI |
| Noometry Index | 30.6 | 27.8 |
| Rank | 289 | 329 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Open |

## Coding

- Yi-1.5-34B: 32.4 (#272)
- Yi-34B: 32.3 (#274)

| Benchmark | Yi-1.5-34B | Yi-34B |
|---|---|---|
| LMArena Coding | 1169 | 1112 |
| BigCodeBench Instruct | 33.9% | — |
| BigCodeBench Complete | 43.8% | — |

## Reasoning

- Yi-1.5-34B: 22.5 (#191)
- Yi-34B: 21.2 (#226)

| Benchmark | Yi-1.5-34B | Yi-34B |
|---|---|---|
| LMArena Hard Prompts | 1160 | 1104 |
| BIG-Bench Hard | — | 71.7% |
| Epoch Capabilities Index | — | 117.39 |

## Math

- Yi-1.5-34B: 27.5 (#249)
- Yi-34B: 21.6 (#282)

| Benchmark | Yi-1.5-34B | Yi-34B |
|---|---|---|
| LMArena Math | 1182 | 1114 |
| MATH Level 5 | 25.5% | 5.1% |
| GSM8K | — | 76% |

## Knowledge

- Yi-1.5-34B: 14.8 (#295)
- Yi-34B: 7.5 (#309)

| Benchmark | Yi-1.5-34B | Yi-34B |
|---|---|---|
| GPQA Diamond | 32% | 14.7% |
| LMArena Expert | 1144 | 1061 |
| MMLU | — | 76.3% |

## Multilingual

- Yi-1.5-34B: 32.3 (#256)
- Yi-34B: 29.7 (#264)

| Benchmark | Yi-1.5-34B | Yi-34B |
|---|---|---|
| LMArena Non-English | 1121 | 1079 |
| LMArena Chinese | 1213 | 1176 |
| LMArena French | 1156 | 1081 |
| LMArena German | 1111 | 1042 |
| LMArena Japanese | 1021 | 993 |
| LMArena Korean | 1005 | 959 |
| LMArena Russian | 1091 | 1050 |
| LMArena Spanish | 1121 | 1070 |

## Instruction Following

- Yi-1.5-34B: 59.2 (#257)
- Yi-34B: 56.2 (#274)

| Benchmark | Yi-1.5-34B | Yi-34B |
|---|---|---|
| LMArena Instruction Following | 1139 | 1091 |

## Long Context

- Yi-1.5-34B: 34.6 (#248)
- Yi-34B: 33.2 (#264)

| Benchmark | Yi-1.5-34B | Yi-34B |
|---|---|---|
| LMArena Longer Query | 1143 | 1094 |

## Writing & Preference

- Yi-1.5-34B: 37.4 (#257)
- Yi-34B: 34.1 (#273)

| Benchmark | Yi-1.5-34B | Yi-34B |
|---|---|---|
| LMArena Text | 1173 | 1129 |
| LMArena Creative Writing | 1135 | 1108 |
| LMArena Multi-Turn | 1153 | 1113 |

## FAQ

### Is Yi-1.5-34B better than Yi-34B?

Yi-1.5-34B is the stronger model overall, scoring 30.6 to 27.8 on the Noometry Index.

### Is Yi-1.5-34B or Yi-34B better for coding?

They score almost the same on coding (32.4 vs 32.3); test both on your own repository before choosing.

### How many benchmarks do Yi-1.5-34B and Yi-34B share?

19 benchmarks have published results for both models. Yi-1.5-34B has 21 scored results on Noometry and Yi-34B has 23.